UHPC-SMA层间静力性能与疲劳寿命相联性

选择热熔型改性环氧树脂202及高黏高弹沥青PG100这两类典型黏层材料，开展UHPC-SMA 复合试件层间静力性能及疲劳性能试验与分析，以探究层间在受剪、受拉不同静力破坏模式下的异同点及关联性，分析剪切静力指标与剪切疲劳寿命的潜在联系. 研究表明，温度对层间黏结性能有明显影响，随着环境温度的上升，层间拉拔强度、剪切强度...

Correlation of Interlayer Monotonic Performances and Fatigue Life between UHPC and SMA

For UHPC-SMA composite specimens, two types of tack coat materials, i.e., hot-melt modified epoxy resin 202 and high-elastic and high-viscosity asphalt PG100, were chosen, and monotonic tests and cyclic tests were carried out. The similarities, differences, and associations were investigated of different interlayer failure modes (shear and tensile). The possible link between various parameters obtained from a monotonic shear test and the shear fatigue life were examined. The results show that the temperature has a significant effect on the interlayer bond perfor? mances. With the increase of test temperature, the pull-off strength and interlayer shearing strength (ISS) decreases greatly, and fatigue life between UHPC and SMA also decreases significantly. Pull-off strength, interlayer shearing strength, shear stiffness (IS), interlayer bonding energy (IBE), and fatigue life of 202 are significantly better than those of PG100, as well as its stability in high temperatures. The pull-off strength has a great linear correlation with ISS, with R2 equaling 0.936, indicating that the pull-off test is a reasonable and reliable method for preliminary evaluating the bond performances between UHPC and SMA. The parameters obtained from the monotonic shear test are closely related to the shear fatigue life. The higher the monotonic parameters, the longer the fatigue life is. The correlations are ranked as: IBE > ISS > IS and R2 are 0.984, 0.945, and 0.779, respectively. IBE accounts for not only the shear force in the interlayer but also the resulting shear deformation resistance of the tack coat, which repre? sents the amount of energy dissipated during interlayer resisting shearing. It can be used as a reliable index to evalu? ate the interlayer bonding performances and to further predict the shearing fatigue life between UHPC and SMA.